Общо наименование фенолфталеин
CAS номер 77-09-8
Фенолфталеин Плътност 1,4±0,1 g/cm3
Фенолфталеин Точка на кипене 557,8±50,0 °C при 760 mmHg
Точка на топене на фенолфталеин 258-263 °C
Молекулна формула на фенолфталеин C20H14O4
Молекулно тегло на фенолфталеин 318.323
Фенолфталеин Точка на запалване 206,5±23,6 °C
Точна маса на фенолфталеин 318.089203
Phenolphthalein is a chemical compound with the formula C20з14О4 and is often written as "HIn", "HPh", "phph" or simply "Ph" in shorthand notation. Phenolphthalein is often used as an indicator in acid–base titrations. For this application, it turns colorless in acidic solutions and pink in basic solutions. It belongs to the class of dyes known as phthalein dyes.
Phenolphthalein is slightly soluble in water and usually is dissolved in alcohols for use in experiments. It is a weak acid, which can lose H+ ions in solution. The nonionized phenolphthalein molecule is colorless and the double deprotonated phenolphthalein ion is fuchsia. Further loss of proton in higher pH occurs slowly and leads to a colorless form. Phenolphthalein ion in concentrated sulfuric acid is orange red due to sulfonation.
Phenolphthalein is one of the most widely used indicators. Phenolphthalein is used as a laxative to treat incomplete and infrequent bowel movement.Phenolphthalein also is used in automotive and aviation industries.
| TEST ITEM |
СПЕЦИФИКАЦИЯ |
РЕЗУЛТАТИ |
| Характеристики |
A white or almost white powder, practically insoluble in water, soluble in alcohol. |
A white powder, practically insoluble in water, soluble in alcohol. |
| Точка на топене |
It melts at about 260°C. |
261ºC.~262ºC. |
| Идентификация |
А: Положителен
б: Положителен |
А: Положителен
б: Положителен |
| Appearance of solution |
The solution is clear and not more intensely colored than reference solution Y7 |
Съответства |
| Сродни вещества |
Less than 0.5% |
<0.5% |
| Тежки метали |
Not more than0.001% |
<0.001% |
| Acidity or alkalinity |
Съответства |
Съответства |
| Chlorides |
Не повече от 0.01% |
<0.01% |
| Sulfates |
Не повече от 0.02% |
<0.02% |
| Загуба при сушене |
Не повече от 0.5% |
0.12% |
| Sulfated ash |
Не повече от 0.1% |
0.01% |
| Анализ |
98.0%-101.0%(C20H14O4) |
99.6% |
| CONCLUSION: Conform With EP6/BP2009 |
